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29th Jun 2004, 10:52 pm | #1 |
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Noisy Philips sets.
The Philips 170A is a big octal valved 1946 radio with an RF stage. My set would tend to become very noisy on LW only, after about 10 minutes operation. The set is full of those splendid Philips "beehive" type trimmers with rotatable caps, sealed (undisturbed from new) with a blob of yellow wax.
In the case of this set, the wax had been applied when too hot, causing it to run down the central spiral stem inside the trimmer, giving rise to an intermittent contact with the trimmer rotor when warmed up. Cleaning off and re-aligning the set cured this fault, and restored its excellent performance. These sets have no lack of gain, despite having no audio pre-amplifier. Does anyone have any suggestions for a suitable locking compound for this type of trimmer? Silicone rubber does not look very authentic! Last edited by Paul Stenning; 27th Dec 2004 at 12:27 pm. Reason: Fix link or code for vBulletin |
16th Jul 2004, 11:23 pm | #2 |
Nonode
Join Date: May 2004
Location: Halifax, West Yorkshire, UK.
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Re: Noisy Philips sets.
Candle wax?
Last edited by Paul Stenning; 27th Dec 2004 at 12:28 pm. Reason: Fix link or code for vBulletin |
17th Jul 2004, 8:01 am | #3 |
Octode
Join Date: May 2003
Location: Belper Derbyshire
Posts: 1,935
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Re: Noisy Philips sets.
How about red tamper proof paint, the type used on the heads of screws?
Christopher Capener
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17th Jul 2004, 11:06 am | #4 |
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Re: Noisy Philips sets.
Nail varnish?
Paul |
17th Jul 2004, 10:25 pm | #5 |
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Re: Noisy Philips sets.
Thanks for all of your suggestions, everyone. In fact, after a bit of experimentation on a scrap trimmer, I have settled on making very small felt washers which push over the pointed central stem. I then applied yellow wax as normal, covering the washer completely, locking the trimmer rotor as Philips did.
Surface tension ensures that the wax soaks into the felt, but does not go right through it, preventing it from running down the stem. No doubt any snags with this scheme will show up after another 50 years. Regards, Leon. |
17th Jul 2004, 11:19 pm | #6 |
Retired Dormant Member
Join Date: Mar 2003
Location: Bishop's Waltham, Hants, UK.
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Re: Noisy Philips sets.
Anti-tamper varnish is available in red and green from Farnell.
Jim. Last edited by Paul Stenning; 27th Dec 2004 at 12:29 pm. |
18th Jul 2004, 8:43 am | #7 |
Dekatron
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
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Re: Noisy Philips sets.
Hi Leon.
Your idea sounds quite good. I normally use nail varnish (having a 20 year old daughter helps here)! Clear is good and neutral of course but as there are so many outlandish colours available now you could probably find yellow available somewhere. Rich
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